Mining uses water primarily for mineral processing, dust suppression, slurry transport. In most mining operations, water is sought from groundwater, streams, rivers and lakes, or through
commercial water service suppliers. Gold mine in Johannesburg also leave Uranium which, if left unattended, will dissolves into ground as a result Rand Water have to extract water from Vaal river which is 80 km away from the city.
The project propose that these water from the mine, both in operation and the one that already stop its operation to be drained out preventing it from contaminating local water source. So that water can be treated and use again.